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Maps are a feature.

An associative array, map, symbol table, or dictionary is an abstract data type composed of a collection of (key, value) pairs, such that each possible key appears at most once in the collection.

Languages with Maps include JSON, Lua, Elixir, EDN, Jule

Example from JSON:
{"name": "Mary"}
Example from Lua:
Example from Elixir:
%{key: "value"}
Example from Jule:
[int:str] { 0: "Key 0", 1: "Key 1", 2: "Key 2", }
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